臺灣大學圖書館是以中西文資料採用不同機讀編目格式的編目作業方式，近年來，面對編目人力縮減的壓力、透過OCLC WorldCat 增進書目國際化的需求，以及國際間轉換MARC21 的趨勢潮流，促使本館積極思考中西文資料統一採用MARC21 為機讀編目格式的可行性及效益。本研究以文獻分析及問卷調查方法分別瞭解國內外使用機讀編目格式的趨勢及轉換經驗；並透過本館2008 年至2010年5 月間所入藏出版品的抄錄編目比率、編目作業以及書目上傳等工作流程的實際測試及分析，評估採用單一MARC21 格式對本館編目作業的工作效益以及書目服務品質的影響。評估結果發現MARC21 格式不論對本館內部的組織人力運用、工作績效，或是外部的編目發展趨勢以及國際接軌目標，都相較CMARC 格式有更直接且深遠的效益。本研究結果與建議將作為臺大圖書館擇用或轉換機讀編目格式之政策參考。

The National Taiwan University Library has been using different MARC formats,CMARC for Chinese/Japanese/Korean and MARC21 for western materials. Recently,to decrease human resources in cataloging, data exchange via OCLC WorldCat andthe international tendency towards MARC21, we started to consider and evaluate theproblems and benefits of transferring MARC21 as a single MARC format by utilizingcontent analysis within foreign experience of transferring to MARC21, questionnairesurvey of university libraries in Taiwan and Statistics / experimental research of NTUlibrary’s collections and workflow of cataloging. The research shows the assessmentof MARC21, which displays on internal impact on human resources utilization,performance and external benefits on long-term development, communication withinternational, and is better than CMARC. The conclusion and suggestions will serve asa reference and guidelines for choosing or transferring the MARC format of the NTUlibrary in the future.